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Top Forums Shell Programming and Scripting Script to tar/rsync/rm multiple folder names Post 302971710 by Don Cragun on Sunday 24th of April 2016 07:56:11 PM
Old 04-24-2016
Quote:
Originally Posted by robertkwild
Ohh so an ! Means not equal to 0
No. The ! keyword in the shell doesn't MEAN anything. It DOES something. As I said before, it "reverses the exit status of the given command (tar in this case) so that if the command fails (exits with a non-zero exit status) it will execute the then clause and if the command succeeds (i.e., exits with zero exit status) it will execute the else clause if there is one.

Look at each of the following if statements and try to determine what the output will be. Then run the command and see if it did what you expected:
Code:
if true; then echo then; else echo else; fi

if ! true; then echo then; else echo else; fi

if ! ! true; then echo then; else echo else; fi

if false; then echo then; else echo else; fi  
 
if ! false; then echo then; else echo else; fi

if ! ! false; then echo then; else echo else; fi

 

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MSSQL_FIELD_SEEK(3)													       MSSQL_FIELD_SEEK(3)

mssql_field_seek - Seeks to the specified field offset

SYNOPSIS
bool mssql_field_seek (resource $result, int $field_offset) DESCRIPTION
Seeks to the specified field offset. If the next call to mssql_fetch_field(3) won't include a field offset, this field would be returned. PARAMETERS
o $result - The result resource that is being evaluated. This result comes from a call to mssql_query(3). o $field_offset - The field offset, starts at 0. RETURN VALUES
Returns TRUE on success or FALSE on failure. EXAMPLES
Example #1 Using mssql_field_seek(3) on the example for mssql_fetch_field(3) <?php // Connect to MSSQL and select the database mssql_connect('MANGOSQLEXPRESS', 'sa', 'phpfi'); mssql_select_db('php'); // Send a select query to MSSQL $query = mssql_query('SELECT * FROM [php].[dbo].[persons]'); // Construct table echo '<h3>Table structure for 'persons'</h3>'; echo '<table border="1">'; // Table header echo '<thead>'; echo '<tr>'; echo '<td>Field name</td>'; echo '<td>Data type</td>'; echo '<td>Max length</td>'; echo '</tr>'; echo '</thead>'; // Dump all fields echo '<tbody>'; for ($i = 0; $i < mssql_num_fields($query); ++$i) { // Fetch the field information, notice the // field_offset parameter is not set. See // the mssql_field_seek call below $field = mssql_fetch_field($query); // Print the row echo '<tr>'; echo '<td>' . $field->name . '</td>'; echo '<td>' . strtoupper($field->type) . '</td>'; echo '<td>' . $field->max_length . '</td>'; echo '</tr>'; // Move the internal seek pointer to the next // row in the result set mssql_field_seek($query, $i + 1); } echo '</tbody>'; echo '</table>'; // Free the query result mssql_free_result($query); ?> SEE ALSO
mssql_fetch_field(3). PHP Documentation Group MSSQL_FIELD_SEEK(3)
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